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Configuration Guide - IP Service
S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DHCP policy VLAN, DNS, mDNS gateway, mDNS relay, UDP Helper, IP performance optimization, IPv6, DHCPv6, IPv6 DNS, IPv6 over IPv4 tunnel, and IPv4 over IPv6 tunnel.

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Dynamic Domain Name Resolution Cannot Be Implemented on a DNS Client

Dynamic Domain Name Resolution Cannot Be Implemented on a DNS Client

Fault Description

The switch functions as a DNS client that is configured with dynamic domain name resolution but cannot resolve domain names to IP addresses correctly.


  1. Run the display dns dynamic-host [ vpn-instance vpn-instance-name | all ] command check whether the specified domain name exists in the dynamic domain name cache.

    • If not, check whether the DNS client communicates with the DNS server properly, the DNS server runs properly, and dynamic domain name resolution is enabled.
    • If so, but the IP address is incorrect, go to step 2.

  2. Run the display dns server [ vpn-instance vpn-instance-name | all ] command to verify that the IP address of the DNS server is correct on the DNS client.

    If the DNS server IP address is incorrect, run the undo dns server ip-address [ vpn-instance vpn-instance-name ] command to delete the configured DNS server IP address, and run the dns server ip-address [ vpn-instance vpn-instance-name ] command to reconfigure a correct IP address for the DNS server.

Updated: 2020-02-26

Document ID: EDOC1000178170

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